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. 2019 Dec 20;7:391. doi: 10.3389/fpubh.2019.00391

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Copyright © 2019 Rojas, Martínez, Martínez, Franco and Jiménez-Molina.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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PRISMA Flow diagram. *PubMed: 20 records; Embase: 12 records; Scielo: 5 records. **Presentations in scientific congresses: 2 presentations; Personal contact: 3 drafts of preliminary results; Reported in other review: 1.